Assigning object reference

[GM Shobha]

class ValHold{
public int i = 10;
}
public class ObParm{
public static void main(String argv[]){
ObParm o = new ObParm();
o.amethod();
}
public void amethod(){
int i = 99;
ValHold v = new ValHold();
v.i=30;
another(v,i);
System.out.print( v.i );
//output is 20 instead of 10??
}//End of amethod
public void another(ValHold v, int i){
i=0;
v.i = 20;
ValHold vh = new ValHold();

v = vh;//instead of this statement if it is v.i=vh.i; output is 10010
System.out.print(v.i);
System.out.print(i);
}//End of another
}
could anybody pl explain why the output of this code is 10020 ?
My answer to this question was 10010.

[Ravi Shankar]

Hi Shobha
The object v which is passed to the method 'another' has a initial value for i as 30 and it gets reset to 20 , so the last value of v.i is 200.
The output is 10010 when u have v.i=vh.i becoz when instantiating the ValHold class the initial value of i is set as 10.
If we remove the line v.i=20 then the out put will be 10030.
Hope this is helpful.
Regards
Ravi

[Ravi Shankar]

sorry about the typo , it is 20 and not 200

[GM Shobha]

The value of v.i is reset to 20.However again v(object) is made to refer to object vh & value of i in vh is 10.

[Badri Sarma]

Hi,
v.i = vh.i
both are different objects so when u try to assign it is assigning the values and not the reference.
vh.i holds 10, so that value will be assigned to v.i
badri

[Francis Siu]

hi GM

 
public void another(ValHold v, int i)
{
  i=0;
  v.i = 20;
  ValHold vh = new ValHold();
  v = vh;//instead of this statement if it is v.i=vh.i; output is 10010
  System.out.print(v.i);
  System.out.print(i);
}//End of another
 

humm...
I remember that this question discuss before.
And I interest to think about why.
When object vh created in the method another(),object v point to the same object of vh,and it is not assign all the value from vh to the v,but it is v point to the same object of vh attribute value.
After end of the method,the object ValHold does not exist.And v use the own object attribute value.
Hope this help

[ May 04, 2003: Message edited by: siu chung man ]